Erick is available for hire

Erick Opelt

Verified Expert in Engineering

Back-end Developer

Joinville - State of Santa Catarina, Brazil

Toptal member since August 24, 2022

Expertise

Back-end Java REST APIs Spring JUnit Apache Maven PostgreSQL Amazon Web Services (AWS)Microservices Git SQL Hibernate Spring Boot Docker Quarkus

Bio

Erick is a senior back-end developer with over six years of experience working with large companies, including Itau and Magalu. He specializes in Java-based stacks like Spring Boot and Quarkus and cloud infrastructures on AWS Lambda and Google Kubernetes Engine (GKE).

Portfolio

Vesta Healthcare

Java, Node.js, AWS Lambda, Amazon Simple Queue Service (SQS), Spring Boot...

LuizaLabs

Java, Quarkus, RabbitMQ, Google Cloud Platform (GCP), Kubernetes, AWS Lambda...

Zup

Java, Spring Boot, SQL Server 2017, Apache Kafka, AWS Lambda...

Experience

Java - 8 years Back-end - 6 years PostgreSQL - 6 years Amazon Web Services (AWS) - 6 years Spring Boot - 5 years Kubernetes - 3 years AWS Lambda - 3 years Amazon Simple Queue Service (SQS) - 2 years

Availability

Part-time

Preferred Environment

Java, Spring Boot, PostgreSQL, MySQL, Kubernetes, Amazon Web Services (AWS), Google Cloud Platform (GCP)

The most amazing...

...thing I've built is a microservice system to store and aggregate the financial records of thousands of clients and communicate with Brazil's Central Bank API.

Work Experience

Senior Back-end Developer

2021 - 2022

Vesta Healthcare

Developed a data pipeline using AWS Kinesis, Amazon SQS, and AWS Lambda to process and validate health insurance data from thousands of customers.
Created and managed a cloud infrastructure and CI/CD for multiple services and tools using AWS CDK and GitHub Actions.
Created metric graphs and application health alerts on Datadog.

Technologies: Java, Node.js, AWS Lambda, Amazon Simple Queue Service (SQS), Spring Boot, PostgreSQL, Back-end, REST APIs, Mockito, WireMock, Clean Architecture, Git, Microservices, Amazon Elastic Container Service (ECS), Amazon EKS, Amazon Simple Notification Service (SNS), JavaScript, SQL, Hibernate, APIs, Amazon DynamoDB, Domain-driven Design (DDD), AWS Cloud Development Kit (CDK), Spring, HTML, CSS, JUnit, HTTP REST, JPA, CI/CD Pipelines, Apache Maven

Senior Back-end Developer

2021 - 2021

LuizaLabs

Architected and developed a system to request and monitor thousands of return orders in one of the largest Brazillian eCommerce.
Created cloud infrastructure for multiple services using Arco CD, Helm Charts, Kubernetes, and Google Cloud.
Implemented an application monitoring stack using OpenTracing, Prometheus, Grafana, and Kibana.

Technologies: Java, Quarkus, RabbitMQ, Google Cloud Platform (GCP), Kubernetes, AWS Lambda, Amazon Simple Queue Service (SQS), Spring Boot, PostgreSQL, MySQL, Back-end, REST APIs, Mockito, WireMock, Clean Architecture, Git, OpenID, Microservices, Amazon Elastic Container Service (ECS), Amazon EKS, SQL, Hibernate, APIs, Domain-driven Design (DDD), Spring, JUnit, HTTP REST, JPA, CI/CD Pipelines, Apache Maven

Back-end Software Developer

2020 - 2021

Zup

Designed and developed a microservice application to handle storage and visualization of financial records of thousands of customers and sync the data with Brazil's Central Bank.
Created test standards and libraries to help write integration tests for Kafka with Avro schema validation and a custom authentication mechanism, helping achieve 100% of code coverage.
Doubled the performance of a microservice that acted as a KafkaConsumer by rewriting how the service uses multiple threads and handles concurrency issues.

Technologies: Java, Spring Boot, SQL Server 2017, Apache Kafka, AWS Lambda, Amazon Simple Queue Service (SQS), Kubernetes, Back-end, REST APIs, Mockito, WireMock, Clean Architecture, Git, Microservices, Amazon EKS, Amazon Simple Notification Service (SNS), SQL, Hibernate, APIs, Amazon DynamoDB, Domain-driven Design (DDD), AWS Cloud Development Kit (CDK), Spring, JUnit, HTTP REST, JPA, Apache Maven

Back-end Software Engineer

2017 - 2020

TOTVS

Architected and developed a no-code web application to design, create, and publish web pages.
Solved critical production issues and provided technical support on an on-premise application.
Migrated a monolith application to a microservice cloud archicture.

Technologies: Java, Spring Boot, Kubernetes, Amazon Web Services (AWS), MySQL, PostgreSQL, Back-end, SQL Server 2017, RabbitMQ, REST APIs, Mockito, WireMock, Clean Architecture, Git, OpenID, Microservices, Amazon EKS, Amazon Simple Notification Service (SNS), JavaScript, SQL, Hibernate, APIs, Spring, HTML, CSS, JUnit, HTTP REST, JPA, CI/CD Pipelines, Apache Maven

Experience

Order Package Tracker

A back-end service to track thousands of packages by integrating external delivery platforms. I have designed and developed multiple back-end services using Java, Quarkus, and Spring Boot that communicate with each other via RabbitMQ Queues and store data on a MySQL database. The system tracks the package status and updates from multiple external APIs of over 100,000 orders daily and provides email and WhatsApp notifications for any update.

Education

2015 - 2020

Bachelor's Degree in Software Engineering

UNIVILLE – Joinville Region University - Joinville, Brazil

Skills

Libraries/APIs

REST APIs, OpenID, Node.js

Tools

Git, Apache Maven, RabbitMQ, Amazon Simple Queue Service (SQS), WireMock, Amazon Simple Notification Service (SNS), Amazon EKS, Amazon Elastic Container Service (ECS), AWS Cloud Development Kit (CDK)

Languages

Java, SQL, JavaScript, TypeScript, HTML, CSS

Frameworks

Spring Boot, Mockito, Hibernate, Spring, JUnit, JPA

Paradigms

Microservices, Clean Architecture

Platforms

Amazon Web Services (AWS), Docker, Kubernetes, AWS Lambda, Google Cloud Platform (GCP), Apache Kafka

Storage

PostgreSQL, MySQL, SQL Server 2017, Amazon DynamoDB

Other

Back-end, APIs, HTTP REST, Algorithms, Domain-driven Design (DDD), CI/CD Pipelines, Quarkus

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